package com.sky.service.impl;

import com.alibaba.fastjson.JSONObject;
import com.sky.constant.MessageConstant;
import com.sky.dto.UserLoginDTO;
import com.sky.entity.User;
import com.sky.exception.LoginFailedException;
import com.sky.mapper.UserMapper;
import com.sky.properties.WeChatProperties;
import com.sky.service.UserService;
import com.sky.utils.HttpClientUtil;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.time.LocalDateTime;
import java.util.HashMap;
import java.util.Map;

@Service
public class UserServiceImpl implements UserService {
    //定义微信服务地址接口常量，https://api.weixin.qq.com/sns/jscode2session
    public static final String WX_LOGIN_URL = "https://api.weixin.qq.com/sns/jscode2session";

    @Autowired
    private WeChatProperties weChatProperties;
    @Autowired
    private UserMapper userMapper;

    /**
     * 微信登录
     * @param userLoginDTO
     * @return
     */
    @Override
    public User wxLogin(UserLoginDTO userLoginDTO) {
        //调用微信接口服务，获当前用户的openid
        String openid = getOpenid(userLoginDTO);
        //判断openid是否为空
        if(openid == null)
            throw new LoginFailedException(MessageConstant.LOGIN_FAILED);
        //判断当前用户是否为新用户
        User user = userMapper.getByOpenid(openid);
        //如果是，则自动注册
        if(user == null) {
            user = User.builder()
                    .openid(openid)
                    .createTime(LocalDateTime.now())
                    .build();
            userMapper.insert(user);
        }
        return user;
    }

    /**
     * 获取微信用户openid,封装的方法
     * @param userLoginDTO
     * @return
     */
private String getOpenid(UserLoginDTO userLoginDTO) {
    Map<String, String> map = new HashMap<>();
    map.put("appid", weChatProperties.getAppid());
    map.put("secret", weChatProperties.getSecret());
    map.put("js_code", userLoginDTO.getCode());
    map.put("grant_type", "authorization_code");
    //发送get请求，获取openid
    String json = HttpClientUtil.doGet(WX_LOGIN_URL, map);
    //返回的是JSON格式，需要转换成对象
    JSONObject jsonObject = JSONObject.parseObject(json);
    //获取openid
    String openid = jsonObject.getString("openid");
    return openid;

}

}
